Features 1、BUILT IN CHIP: Relay module built in stable USB to serial chip and microcontroller, serial debugging software can send serial commands to the computer to control the 8 relays on and off, you can also send commands to the serial port relay status. 2、USB RELAY MODULE: The relay module has a 5V supply voltage and supports USB power or external power switch. 3、ABS MATERIAL: The plate of the relay module is made of ABS, which has good wear resistance and insulation and long service life. 4、SAFE TO USE: This relay module has over current protection and relay diode renewal protection, making your use more secure and safe. 5、LONG SERVICE LIFE: With a long electrical life of 100,000 continuous connections, this relay will meet your long term use needs. Specification Item Type: 8 Channel Relay Module Material: ABS, electronic components Chip: On board 8 bit high performance microcontroller chip Output Type: Relay switch signal Package List 1 x 8 Channel Relay Module